Dana wanted to sign Mousasi, but he resigned with Strikeforce because he can compete in DREAM and pursue his boxing career. He's making enough $$$ that he plans on retiring at 30.
Dana wanted to sign Alistair Overeem, Semmy Schilt, and Manhoef last year, but they were making more $$$ in K-1. Alistair is fighting in Strikeforce next month.
Fedor is part owner of M-1, so he is making more $$$ signed to Strikeforce with the co-promotion and he has the freedom to compete in DREAM and Sambo. Fedor is rumored to fight Josh Barnett in DREAM on New Year's Eve.
Randy Couture on Brock Vs. FedorStrikeforce was offering Henderson comparable $$$ to the UFC, but with more liberties.
Diaz wants to fight GSP and Anderson, but he wants it to be a one time deal. Nick is fighting Mach Sakurai next month in DREAM.